COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes AD/CESSNA 170/27 Fuel System Placard 5/72 Applicability: All 172 and F172 series with S/Nos. 28000 to 29999, 36000 to 47746 (excluding 46000), 17247747 to 17258855 and F17200001 to F17200779 not incorporating Service Kit 172-31B or 172-32. Requirement: Action in accordance with Cessna SL SE72-7. Compliance: Within 100 hours time in service after 31 May 1972.